Usually testers are used to put an application to the test; it's not certain, though, that they are prepared at the code level.
When this happens, you have the best, because the tester knows where the problem is and already gives the developer a solution.
Over time, the tester also becomes familiar with the code and may even become a very good developer
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Yeah maybe a tester may not have knowledge on the code initially. But logic wise they would be very strong and they can easily pick up all dev concepts.